Research Article
Fatigue Strength Evaluation for Remanufacturing Impeller of Centrifugal Compressor Based on Modified Grey Relational Model
Table 4
Factor set, subfactor set, and the rating scale.
| | Factor sets | Subfactor sets | Score |
| | Parameter (U1) | u11 | Width of blade inlet | 4 | | u12 | Diameter of blade inlet | 3 | | u13 | Installation angle of blade inlet | 1 | | u14 | Curvature radius of blade | 1 | | u15 | Blade thickness | 5 | | u16 | Velocity of blade inlet | 3 | | u17 | Slope of wheel cover | 1 |
| | Working condition (U2) | U21 | Inlet pressure | 2 | | U22 | Outlet pressure | 3 | | U23 | Input speed | 4 | | U24 | Inlet temperature | 2 | | u31 | Lubrication condition | 2 |
| | Working condition (U3) | u32 | Wear degree | 2 | | u33 | Cleanness of fluid | 1 |
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